[LLVMdev] Arm port

Sandeep Patel deeppatel1987 at gmail.com
Fri May 22 16:56:13 PDT 2009

Build systems are a means to an end. The interesting stuff here is a
compiler. See <http://en.wikipedia.org/wiki/Bicycle_shed>.

If bending CMake to support BSD Make isn't in the cards, then I'd
suggest installing GNU Make and being done with it. It'll probably
work and I'd bet that the llvm-gcc autoconf manchinery probably
assumes gmake anyway, so you may well be stuck with it.

(FWIW, I find all of these build systems abhorrent in design and syntax.)


On Fri, May 22, 2009 at 7:22 AM, Chuck Robey <chuckr at telenix.org> wrote:
> Sandeep Patel wrote:
>> My goal is to have Cortex-A9 support complete in far less than three
>> months. I've recently gotten some additional help toward that goal, so
>> the pace should pick up soon.
>> As far as compiler texts, there are many newer texts to recommend as
>> just about all the major optimization passes are done differently
>> after SSA-form appeared in about 1991. However, for adding Cortex-A8
>> support, I don't think you'll need to know anything more than the old
>> Dragon book (Aho/Sethi/Ullman) has in it. Instruction selection is
>> done in LLVM using SelectionDAGs and the TableGen tool and it's
>> domain-specific language.
>> Start by looking at llvm/lib/Target/ARM/ARMInstrInfo.td and seeing how
>> the basic instructions are matched. For armv7/armv7a, a new file will
>> want to be created similar to how ARMInstrVFP.td is sequestered.
> OK, I've got enough to go on with, and I'm getting ready right now to begin
> reading the dragon book, but one question bothers me regarding the present setup
>  of llvm: the use of the present Makefile tools (dmake & gmake).  I was rather
> surprised to find that a project that is bent toward supporting the BSD Unixes
> doesn't have a set of BSD Makefiles.  I'm not saying you  have to toss away your
> dmake/gmake files, you could keep them for those who feel more at ease in using
> them, but shouldn't you have a set of BSD makefiles also?  It happens that I
> have experience using those makefiles, and adding in a set of Makefiles designed
> to allow use of the BSD Make and the BSD Make template files (all those files in
> /usr/share/mk on any *BSD system wouldn't be all that difficult to accomplish,
> Would that be something you might wish to add?
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